Chalk dust tool



FIG. 1 is a perspective view of a perspective view a chalk dust tool showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design of a chalk dust tool, as shown. 